28165775 has 18 divisors (see below), whose sum is σ = 38393376. Its totient is φ = 20482000.

The previous prime is 28165759. The next prime is 28165789. The reversal of 28165775 is 57756182.

It is not a de Polignac number, because 28165775 - 2⁴ = 28165759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1631 + ... + 7680.

Almost surely, 2^28165775 is an apocalyptic number.

28165775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28165775 is a deficient number, since it is larger than the sum of its proper divisors (10227601).

28165775 is a wasteful number, since it uses less digits than its factorization.

28165775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9343 (or 9327 counting only the distinct ones).

The product of its digits is 117600, while the sum is 41.

The square root of 28165775 is about 5307.1437704287. The cubic root of 28165775 is about 304.2569928356.

The spelling of 28165775 in words is "twenty-eight million, one hundred sixty-five thousand, seven hundred seventy-five".